Preheat the broiler. Spread 2 tbsp. pesto (homemade or store bought) on 1 whole-grain 8-inch tortilla. Sprinkle with 2 tbsp. chopped broccoli florets, a large handful of spinach, 4 sliced baby bella mushrooms, 2 tbsp. chopped onions, and 2 tbsp. part-skim mozzarella. Broil until cheese is lightly browned, about 4 minutes.